<u># 用法</u>
<em>色调映射</em>
<u># 语法</u>
<em>renderer</em>.<b>toneMapping</b> = <q>Three</q>.<s>LinearToneMapping</s> 		<em>// 默认值，线性色调映射</em>
<em>renderer</em>.<b>toneMapping</b> = <q>Three</q>.<s>NoToneMapping</s> 			<em>// 禁用色调映射</em>
<em>renderer</em>.<b>toneMapping</b> = <q>Three</q>.<s>ReinhardToneMapping</s>
<em>renderer</em>.<b>toneMapping</b> = <q>Three</q>.<s>Uncharted2ToneMapping</s>
<em>renderer</em>.<b>toneMapping</b> = <q>Three</q>.<s>CineonToneMapping</s>
